<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
    <head>
        <style type="text/css">
        .red {
            background-color: red;
        }
        .green {
            background-color: green;
        }
        .blue {
            background-color: blue;
        }
        div {
            width: 100px;
            height: 100px;
            float: left;
        }
        body {
            margin: 0;
        }
        </style>
    </head>
    <body>
        <div class="red"></div>
        <div class="green"></div>
        <div class="blue"></div>
    </body>
</html>
